Can not learn to prevent PDF documents are modified by the three major techniques

In our daily work or study, we usually choose to save some important documents as PDF format,convert scanned pdf to word online free but PDF documents can still be edited and modified by some software. So, how can we protect PDF documents so that they are not easily modified?

Method One: Set up encryption protection

Here refers to the encryption does not require the entry of a password to open, we have to do is that the document can be opened, but can not be modified or printed, etc.;;.

PDF Editor as an example,scanned pdf to word converter online open the document we need to encrypt, click on the upper right corner of the toolbar "document" - select "security" can be set for the document password.

Check the "need to change the security", enter a simple password, cancel the "Edit" or "Print" and other operations check, save and open the document again you need to enter the correct password! to the document to "print" or "edit".

Method 2: Print the document into a picture style

The above method of an operation is relatively simple,investintech free online pdf to word converter but there are many decryption software, it is easy to crack. We can also print the document as a picture of the PDF document style, so it is not easy to modify.

Here you need to use PDF virtual printing. After opening a PDF document, select Print, the printer option is Foxit PhantomPDF printer, so that the printout of the document with the same scanned document, the entire document is a picture, neither copy, nor can it be modified.

However, compared with the first method, this method will lead to relatively fuzzy PDF documents, document memory is large.

Method 3: Add a watermark and print as a picture

About the above method two for the PS more powerful people, three or two to modify a few text or content is also very simple, for insurance purposes, we can first add a watermark to the document, and then print the document into a picture of the way the document will be better. Watermark can increase the difficulty of PS, and even after modifying the traces will be very obvious, this method can be called double insurance.

We can first use the PDF editor to add a watermark to the document, click on the toolbar in the upper right corner of the document - select the watermark - add, can be added directly to the system, you can also customize. Add a watermark, you can follow the second method of printing above.

The above three methods have their own advantages and disadvantages, we can choose the process that suits their needs.

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